#include <iostream>
#include <vector>
#include <string>
#include <unordered_map>

using namespace std;

class Solution
{
public:
    int fourSumCount(vector<int> &nums1, vector<int> &nums2, vector<int> &nums3, vector<int> &nums4)
    {
        unordered_map<int, int> ump;
        
    }
};

int main()
{
    vector<int> nums1 = {1, 2}, nums2 = {-2, -1}, nums3 = {-1, 2}, nums4 = {0, 2};
    Solution s;
    cout << s.fourSumCount(nums1, nums2, nums3, nums4) << endl;
    return 0;
}
